Weight is an issue for both sexes, but the penis stuff I figure is mostly intended for men. I don't recall seeing much targeted at women at all.
benndragon brings to mind a question:
Why does "self-improvement" spam target men so much more than women?
Men have more money.
Men are more gullible.
Women are not insecure about their bodies.
Spammers just haven't figured out what women want.
You're just not noticing the ads targeted to women.
Women are only insecure about being fat.
It's all about the cock. Women are buying pills for their men just as much as men are buying them for themselves.
(Any other answers go in comments.)
(In other news, I have a passport. Yow! Does GÖTTINGEN need SYSADMINS yet?)